CN210826292U - Heating furnace test device - Google Patents
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- CN210826292U CN210826292U CN201921049234.XU CN201921049234U CN210826292U CN 210826292 U CN210826292 U CN 210826292U CN 201921049234 U CN201921049234 U CN 201921049234U CN 210826292 U CN210826292 U CN 210826292U
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Abstract
The utility model discloses a heating furnace test device belongs to heating furnace technical field. The utility model comprises a hearth, a bracket for supporting steel billets is arranged in the hearth, a sectional temperature control unit comprises a plurality of heating sections which are respectively provided with different heating curves, and circulating air sequentially enters the hearth through the heating sections to realize the heating of the steel billets; the hot air outlet pipeline is arranged at the outlet of the hearth, the circulating air is divided into two paths through the hot air outlet pipeline, one path of circulating air is directly discharged through the exhaust pipeline, the other path of circulating air is mixed with fresh air from the fresh air pipeline and then enters the circulating air pipeline, and the mixed circulating air enters the hearth through the sectional type temperature control unit again. The utility model aims to overcome the not enough of the test equipment of current steel billet heating system research with high costs, the uncertain etc. of time of test, not only can solve the optimization of steel billet heating system, can also reduce cost, control test time.
Description
Technical Field
The utility model relates to a heating furnace technical field, more specifically say, relate to a heating furnace test device.
Background
In the hot rolling process of the ferrous metallurgy industry, in order to ensure the rolling requirement, a billet needs to finish a secondary heating process in a heating furnace, the heating target temperature is about 1200 ℃ generally, and the temperature difference of the cross section is lower than 30 ℃. The heating system of the heating furnace determines the tapping temperature and the section temperature difference of the billet steel, and the temperature system is determined by the temperature distribution of a hearth and the heating time. Therefore, the research on the influence rule of the heating system on the temperature field of the steel billet is always the focus of attention. The existing research is mainly completed from both aspects of CFD simulation and black box test.
CFD simulation: and (3) properly assuming a physical model of the heating furnace by using CFD software, establishing geometric modeling, carrying out grid division on the geometric modeling, setting corresponding boundary conditions, and completing a simulation task of a temperature field, a speed field and a temperature field of a billet of the hearth of the heating furnace. And an optimized heating system is searched by setting different boundary conditions, so that the efficient heating of the steel billet is realized. This theoretical study itself has a very large uncertainty, which can cause large errors. Firstly, due to the complexity of the hearth structure of the heating furnace, various assumptions need to be made during geometric modeling, otherwise, a geometric model cannot be effectively established; secondly, the quality of the meshing also severely affects the accuracy of the model calculation. Therefore, the optimized heating system obtained by the CFD simulation method needs to be corrected after testing with a black box in practical application.
Testing a black box: in order to study the change rule of the temperature field of the steel billet in the whole heating process, the black box test is a very important means. Holes with different depths are punched on the billet, thermocouples are arranged, a black box (a temperature detection device with water cooling) is fixed on the test billet, and the black box and other billets are charged together according to a normal production plan. And in the heating process, the furnace gas temperature of the test billet is detected, the temperature of each measuring point is detected, and finally the test billet is discharged. The test method can obtain the furnace gas temperature in the billet heating process and the temperature field of the billet. However, the black box test is limited by the time of a serious production plan on one hand and is influenced by high test cost on the other hand, and cannot be timely and effectively carried out.
Therefore, the core of the above two methods is the black box test, and the time and cost limitations of the black box test cannot be overcome. Therefore, a new and low-cost test equipment for billet heating system research is needed. At present, the research is carried out at home and abroad, and the results are shown as follows.
Through search, a great deal of patents have been published on the study of the heating system of the billet, such as the patent applied by the Faftistein metallurgy technology (Shanghai) Limited-a walking beam furnace for hot rolling, the patent application number is 2018207344333, the patent scheme is mainly optimized and improved in the aspect of the traditional temperature measurement control of the heating furnace, namely an upper-row burner heating control device and a lower-row burner heating control device are additionally arranged and respectively arranged at the top in a hearth and the bottom in the hearth to solve the problem that the upper surface and the lower surface of a heated product in the heating furnace are heated unevenly due to over burning or under burning of the lower part of the burner caused by inaccurate temperature measurement of the side burner.
For another example, a patent applied by Changzhou Longte wear-resistant ball Co., Ltd, which is a dual-temperature dual-control device for an annular heating furnace, has a patent application number of 2018212194035, and in order to solve the problems of aging caused by long-time high-temperature environment of a temperature measuring device, further temperature distortion and the like, a first thermocouple, a second thermocouple, a first temperature monitoring device and a second temperature monitoring device are additionally arranged on the existing annular heating furnace, so that the reliability of temperature measurement is improved, and the control precision and accuracy of the heating furnace are ensured.
For another example, the patent of Annu Steel products Ltd, a dynamic furnace temperature control method for a hot rolling heating furnace, the patent application number is 2017105693626, the method comprises the steps of periodically calculating the real-time temperature of steel billets in the furnace, predicting the residual time of the steel billets in the furnace, and the like, dynamically adjusting the furnace temperature of different steel types, determining the optimal furnace temperature set value, and realizing the optimal operation of the heating furnace.
For another example, the patent of the heating furnace dynamic operation calculation method applied by the limited Chinese petroleum and natural gas company has the patent application number of 2018109081765, and the method comprises the steps of determining the relation between the temperature rise and the efficiency of the heating furnace, determining the relation between the exhaust gas temperature and the efficiency of the heating furnace, determining the relation between the load rate and the efficiency of the heating furnace, establishing a heating furnace thermal efficiency control layout and the like, so that the online visual reflection of the operation state of the heating furnace is realized, and the optimal operation of the heating furnace is guided.
In summary, the first two patent schemes are mainly to meet the production requirements and perform local optimization and improvement on the heating furnace, and the second two patent schemes are mainly to realize the optimized operation of the heating furnace from the operating angle of the heating furnace. Generally speaking, the method belongs to the improvement of production equipment, and does not belong to ideal test equipment. The optimization of the billet heating system, the study of the billet heat transfer mechanism and the establishment of the billet heating system of the new steel grade can be realized only by a heating furnace for production with a large amount of time and high cost. Therefore, how to design a heating furnace test device and a test method consistent with the field working condition is a technical problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
1. Technical problem to be solved by the utility model
The utility model discloses aim at overcomes the experimental not enough of equipping with high costs, the uncertain etc. of time of test of current steel billet heating system research, provides a heating furnace test device, not only can solve the research in aspects such as steel billet heating system optimization, steel billet heat transfer mechanism and new steel kind steel billet heating system, can also reduce cost, command test time.
2. Technical scheme
In order to achieve the above purpose, the utility model provides a technical scheme does:
the utility model discloses a heating furnace test device, including furnace, be equipped with the bracket that is used for bearing the steel billet in the furnace, circulating air gets into furnace through sectional type temperature control unit, wherein sectional type temperature control unit includes a plurality of heating segments that are set for different heating curves respectively, circulating air loops through above-mentioned heating segment and gets into furnace after realizing the heating to the steel billet; the hot air outlet pipeline is arranged at the outlet of the hearth, the circulating air is divided into two paths through the hot air outlet pipeline, one path of circulating air is directly discharged through the exhaust pipeline, the other path of circulating air is mixed with fresh air from the fresh air pipeline and then enters the circulating air pipeline, and the mixed circulating air enters the hearth through the sectional type temperature control unit again, so that continuous heating of steel billets is realized.
As a further improvement of the utility model, the sectional type temperature control unit includes along the air heating I section, air heating II section, air heating III section and the air heating IV section that are arranged in proper order near the furnace direction, and the end of air heating I section, air heating II section, air heating III section and air heating IV section is provided with third thermocouple, fourth thermocouple, fifth thermocouple and sixth thermocouple respectively.
As a further improvement, the sectional type temperature control unit further comprises a three-phase alternating current power supply, the three-phase alternating current power supply is connected with resistance wires in each heating section through a three-phase alternating current contactor, and the resistance wires are used for heating an air heating I section, an air heating II section, an air heating III section and an air heating IV section respectively.
As a further improvement, the utility model discloses all be equipped with the temperature controller on air heating I section, air heating II section, air heating III section and the air heating IV section.
As a further improvement, the top of the hearth near the outlet extends downwards to form a guide plate.
As a further improvement, the temperature measuring hole of the different degree of depth is offered to inside the steel billet, and the welding of steel billet thermocouple is in the temperature measuring hole and fill the reinforcement through refractory material.
As a further improvement, the billet thermocouple is connected to the signal acquisition module through the thermocouple lead-out wire passing through the magnetic bead, and the signal acquisition module is connected to the computer.
As a further improvement, the fresh air pipeline is provided with a fresh air electric valve, the exhaust pipeline is provided with an exhaust electric valve, and the opening of the fresh air electric valve is the same as that of the exhaust electric valve.
As a further improvement, the utility model is equipped with the air-blower on the circulating air pipeline, and the front end of air-blower is equipped with first thermocouple, still is equipped with the return air motorised valve on the circulating air pipeline, and the aperture of return air motorised valve and the aperture of new trend motorised valve sum is 100%.
As a further improvement, the utility model discloses be equipped with the cooling device of airing exhaust on the exhaust duct, be equipped with the cooling water electric valve on the cooling device of airing exhaust, and the cooling device exit end of airing exhaust is equipped with the second thermocouple, and second thermocouple rear end is equipped with the exhaust fan, and the second thermocouple is used for detecting the temperature of airing exhaust of the cooling device exit end of airing exhaust and controls the aperture of cooling water electric valve.
3. Advantageous effects
Adopt the technical scheme provided by the utility model, compare with prior art, have following beneficial effect:
(1) the utility model discloses a heating furnace test device carries out the mode that the segmentation heated to circulating air through set up sectional type temperature control unit in the furnace outside, has realized the full flow heating simulation of steel billet in the heating furnace completely to accomplish the collection of steel billet temperature field data and burner gas temperature data in the whole flow, be favorable to deep research steel billet heating system optimization, the steel billet heat transfer mechanism of different steel grades and the formulation of accomplishing new steel grade steel billet heating system.
(2) The utility model discloses a heating furnace test device compares with traditional steel billet black box test, saves time. The traditional steel blank black box test is influenced by the production plan of the heating furnace, a corresponding test plan needs to be made according to the production plan, and the traditional steel blank black box test belongs to a passive test. The test device belongs to active test, and the test can be completed only by the good running of the test equipment, so that a large amount of time can be saved.
(3) The utility model discloses a heating furnace test device can reduce cost, and the reason lies in accomplishing a heating furnace black box test, needs the expense to be about 15 ten thousand yuan-25 ten thousand yuan and varies, still involves including relevant departments such as test unit, production unit, process unit in addition, needs a large amount of human costs. The test adopting the device can be carried out by a process department, and the relevant test can be finished by transporting the tested steel billet to an experimental department, so that the cost can be saved by more than half at least.
(4) The utility model discloses a heating furnace test device because steel billet temperature field test equipment arranges steel billet heating furnace in the region beyond, has reduced equipment damage risk, and traditional black box test probably changes temporarily because the production plan of production department (like rolling mill trouble etc.), perhaps because test steel billet can't in time go out of the stove in the heating furnace, leads to the black box to be heated overtime, arouses black box test equipment to damage.
(5) The utility model discloses a heating furnace test device can improve the test accuracy. The traditional black box test adopts the continuous movement of the steel billet in the heating furnace, the steel billet is subjected to a continuously changing temperature field in a hearth to complete the heating process of the steel billet, and a data acquisition system is utilized to realize the acquisition and storage of the data in the heating process. But the vibration is caused in the process that the billet steel continuously moves in the furnace, and the vibration probably causes the thermocouple of the billet steel to fall off, thereby influencing the accuracy of the measured data of the thermocouple. The test device adopts the mode that the position of the steel billet is fixed and the temperature of furnace gas is continuously changed, so that the condition that the thermocouple falls off due to the vibration of the steel billet is avoided, and the test accuracy is improved.
(6) The utility model discloses a heating furnace test device, the test object is extensive. The traditional black box test is limited by the size of a billet and the size of a furnace door, so that the black box cannot be fixed on the small-size billet (the furnace door of a heating furnace for the small-size billet is smaller, and a black box test device cannot be normally charged and discharged). Therefore, the black box testing device can only be applied to the heating process of large-size steel billets (such as a plate heating furnace), and can not be applied to a wire heating furnace, a bar heating furnace and the like. The test device is arranged outside the furnace and is not influenced by the conditions, so that the test device is suitable for both large-size steel billets and small-size steel billets.
(7) The utility model discloses a heating furnace test device, the simulation object is extensive, and the experimental accessible that adopts this device is to the different combinations of each circulating air heating section to and different temperature curve's settlement, realize the heating simulation to different models such as three-section stove, four-section stove.
Drawings
FIG. 1 is a schematic structural diagram of a heating furnace test device of the present invention;
FIG. 2 is a schematic view of the temperature control process of each heating section of the circulating air of the present invention;
FIG. 3 is a schematic view of the heating curve setting of the temperature controller for each heating section of the circulating air according to the present invention;
wherein, the figure a is the heating curve setting of the temperature controller at the air heating I section;
figure b is the heating curve setting of the air heating II-stage temperature controller;
figure c is the heating curve setting of the air heating III-stage temperature controller;
figure d is the heating curve setting of the air heating IV stage temperature controller; FIG. 4 is a schematic view of the punching depth of the upper surface, center and lower surface of the billet in the present invention;
FIG. 5 is a schematic diagram of a flow control process for blower protection according to the present invention;
fig. 6 is a schematic view of the control flow of the protection and exhaust temperature of the middle exhaust fan of the present invention.
The reference numerals in the schematic drawings illustrate:
100. a hearth; 110. a hot air outlet duct; 120. a baffle; 130. a bracket;
200. a steel billet; 201. a billet thermocouple; 210. measuring the temperature of the upper surface; 220. measuring a central temperature point; 230. measuring a lower surface temperature point;
300. a fresh air duct; 310. a fresh air electric valve;
400. an exhaust duct; 410. an exhaust electric valve; 420. a second thermocouple; 430. an exhaust fan; 440. a chimney; 450. an exhaust air cooling device; 451. a cooling water electric valve;
500. a circulating air duct; 510. a first thermocouple; 520. a blower; 530. an air return electric valve;
610. air heating section I; 611. a third thermocouple; 620. air heating section II; 621. a fourth thermocouple; 630. air heating section III; 631. a fifth thermocouple; 640. air heating section IV; 641. a sixth thermocouple; 650. a temperature controller; 660. A three-phase AC power supply; 670. a three-phase AC contactor;
710. a thermocouple lead-out wire; 720. a signal acquisition module; 730. and (4) a computer.
Detailed Description
For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The present invention will be further described with reference to the following examples.
Example 1
The study on the influence rule of the heating system of the traditional heating furnace on the temperature field of the billet steel is generally completed by two modes, namely CFD simulation and black box test, but the core of the two modes is the black box test, and the time and cost limitations of the black box test cannot be overcome. The heating furnace test device of the embodiment can overcome the defects and realize the full-flow heating simulation of the billet steel in the heating furnace. With reference to fig. 1 to 6, the heating furnace testing apparatus of the present embodiment includes a furnace 100, a bracket 130 for supporting a steel billet 200 is disposed in the furnace 100, a testing position of the steel billet 200 in the furnace 100 is fixed, a heating process of the steel billet 200 is completed by different continuous changes of a temperature of circulating air in the furnace 100, a phenomenon that a welding point of a thermocouple drops off due to continuous movement of the steel billet 200 in a previous black box test is avoided, and a testing accuracy is improved. As shown in fig. 1, in the present embodiment, the circulating air enters the furnace 100 through the sectional type temperature control unit, where the sectional type temperature control unit includes a plurality of heating sections with different heating curves respectively set therein, the circulating air sequentially enters the furnace 100 through the heating sections to heat the steel billet 200, the circulating air can be heated in a sectional type, the simulation of the whole heating process of the steel billet 200 is realized, and the heating simulation of different types of heating furnaces such as a three-section furnace, a four-section furnace, and the like can be realized by setting different temperature curves and different combinations of the heating sections, and the simulation objects are wide. In this embodiment, the hot air outlet pipeline 110 is disposed at the outlet of the furnace 100, the circulating air is divided into two paths through the hot air outlet pipeline 110, one path of circulating air is directly discharged through the exhaust pipeline 400, the other path of circulating air is mixed with the fresh air from the fresh air pipeline 300 and then enters the circulating air pipeline 500, the mixed circulating air enters the furnace 100 through the sectional temperature control unit again, the cyclic utilization of the circulating air is realized, the continuous heating of the steel billet 200 is further realized, and the full-flow heating simulation of the steel billet 200 is completed.
As shown in fig. 1, the segmented temperature control unit in this embodiment includes an air heating I section 610, an air heating II section 620, an air heating III section 630, and an air heating IV section 640, which are sequentially arranged in a direction close to the furnace 100, that is, as shown in the orientation in fig. 1, the air heating I section 610, the air heating II section 620, the air heating III section 630, and the air heating IV section 640 are sequentially distributed from left to right along the circulating air duct 500, and the ends of the air heating I section 610, the air heating II section 620, the air heating III section 630, and the air heating IV section 640 are respectively provided with a third thermocouple 611, a fourth thermocouple 621, a fifth thermocouple 631, and a sixth thermocouple 641, which are used to detect the temperature of the circulating air at the outlet position of each heating section, so as to facilitate the implementation of the segmented temperature simulation, and ensure that the temperature of the heated circulating air outlet. The sectional type temperature control unit in this embodiment further includes a three-phase ac power supply 660, and the three-phase ac power supply 660 is connected with resistance wires in each heating section through a three-phase ac contactor 670, and respectively heats the air heating section I610, the air heating section II 620, the air heating section III 630 and the air heating section IV 640 through the resistance wires. As shown in fig. 1, in this embodiment, temperature controllers 650 are respectively disposed on the air heating section I610, the air heating section II 620, the air heating section III 630 and the air heating section IV 640, the temperature controllers 650 are used for controlling the temperatures of the respective heating sections, and the temperature control manner is as described in fig. 2. The heating curves of the air heating I section 610, the air heating II section 620, the air heating III section 630 and the air heating IV section 640 in the present embodiment are as shown in fig. 3, and the specific operations are as follows:
1. a furnace body preheating simulation stage: at [0, t1]In the time period, the air heating I section 610, the air heating II section 620, the air heating III section 630 and the air heating IV section 640 set the circulating air temperature from the initial temperature T through the preheating temperature setting curves of the respective temperature controllers 6500Heating to T1Introducing the billet into the hearth 100 to heat the billet 200, and completing the preheating of the billet 200 in the air heating I section 610, the air heating II section 620, the air heating III section 630, the air heating IV section 640 and the hearth 100, namely realizing that the billet 200 is preheated in [0, t ] in the figures a, b, c and d1]In the time period, the temperature controllers 650 of the air heating I section 610, the air heating II section 620, the air heating III section 630 and the air heating IV section 640 are preheated.
2. A preheating section simulation stage: at [ t ]1，t2]During the period of time, the user can select the time period,the air heating I section 610, the air heating II section 620, the air heating III section 630 and the air heating IV section 640 continue to change the temperature of the circulating air from T through the temperature setting curves of the respective preheating sections of the temperature controllers 6501Heating to T2Introducing the billet into the hearth 100 to heat the billet 200, realizing the temperature simulation of the circulating air in the preheating section hearth 100, and finishing the preheating section heating process simulation of the billet 200, namely realizing the conditions in a graph a, a graph b, a graph c and a graph d in a time (t)1，t2]In the time period, the preheating sections of the temperature controllers 650 of the air heating I section 610, the air heating II section 620, the air heating III section 630 and the air heating IV section 640 simulate the temperature rising process.
3. A heating section simulation stage: at [ t ]2，t3]During the time period, the circulating air is first heated by the air to the constant temperature (T) of the I section 6102) After heating, the temperature of the circulating air is continuously changed from T through a heating section temperature setting curve of each temperature controller 650 in the air heating II section 620, the air heating III section 630 and the air heating IV section 6402Heating to T3Realizing the temperature simulation of the circulating air in the hearth 100 of the heating section and finishing the simulation of the heating process of the heating section of the billet 200, namely realizing that in the drawing a, the drawing b, the drawing c and the drawing d, the temperature is t2，t3]In the time period, one heating section of the temperature controllers 650 of the air heating II section 620, the air heating III section 630 and the air heating IV section 640 simulates a temperature rise process.
4. And a second heating section simulation stage: at [ t ]3，t4]In the time period, the circulating air is heated by the air firstly in the I section 610 to be constant temperature (T)2) Heating, and constant temperature heating (T) via air heating II section 6203) Heating, and setting temperature curves of the air heating III section 630 and the air heating IV section 640 through two heating sections of respective temperature controllers 650 to continuously adjust the temperature of the circulating air from T3Heating to T4Realizing the temperature simulation of the circulating air in the hearth 100 of the two heating sections and finishing the heating process simulation of the two heating sections of the billet 200, namely realizing that in the graph a, the graph b, the graph c and the graph d, the temperature is t3，t4]In the time period, the two heating sections of the temperature controller 650 of the air heating III section 630 and the air heating IV section 640 simulate the temperature rising process.
5. A soaking section simulation stage: at [ t ]4，t5]In the time period, the circulating air is heated by the air firstly in the I section 610 to be constant temperature (T)2) Heating, and constant temperature heating (T) via air heating II section 6203) Heated and then thermostatically heated (T) by an air heating III stage 6304) Heating, heating with air in IV stage 640, setting temperature curve of temperature controller 650, and controlling circulating air temperature to be T4Slowly rises first and gradually falls to T5，T5Slightly lower than T4Realizing the temperature simulation of the circulating air in the soaking zone hearth 100 and finishing the soaking zone heating process simulation of the billet 200, namely realizing that in the graph a, the graph b, the graph c and the graph d, the temperature is t4，t5]In the time period, the soaking section of the temperature controller 650 of the IV section 640 is heated by air to simulate the temperature rising process. The temperature and heating time settings of each heating section in this embodiment can be determined according to actual test requirements.
According to the setting of the temperature curves of the heating sections, the furnace body preheating simulation, the preheating section simulation, the first heating section simulation, the second heating section simulation and the soaking section simulation are completed in sequence, and the full-process simulated heating of the steel billet 200 is realized. The process can be changed according to the specific type of the heating furnace, and is convenient to be applied to the simulation experiment of the steel billet 200 in the heating furnaces of various types.
Compared with an actual heating furnace, the hearth 100 in the embodiment has a shorter space length, and in order to prevent short circuit of hot air flow, the guide plate 120 is extended downwards from the top near the outlet to divide the interior of the hearth 100 into a heating area and an exhaust area, as shown in fig. 1, through the arrangement of the guide plate 120, hot air can uniformly pass through the upper surface and the lower surface of the billet 200 in the furnace and heat the billet, so that the actual working condition of production is met.
In this embodiment, temperature measuring holes with different depths are formed in the steel billet 200, and a steel billet thermocouple 201 is disposed in each temperature measuring hole, specifically, as shown in fig. 4, three types of temperature measuring points are formed in the steel billet 200, and an upper surface temperature measuring point 210, a central temperature measuring point 220, and a lower surface temperature measuring point 230 are sequentially formed from the upper surface of the steel billet 200 downward, and are respectively used for detecting the upper surface temperature, the central temperature, and the lower surface temperature of the steel billet 200. The thickness of the billet 200 is a, wherein the distance from the upper surface temperature measuring point 210 to the upper surface of the billet 200 is c, specifically, c is 25mm in the embodiment; the distance from the center temperature measuring point 220 to the upper surface of the billet 200 is a/2, the distance from the lower surface temperature measuring point 230 to the upper surface of the billet 200 is b, and specifically, b is (a-25) mm in the embodiment. Through the temperature measurement to the different degree of depth measuring points in the inside steel billet 200, realized the temperature of steel billet 200 comprehensive the accuse, and the measuring result is more accurate. The welding of steel billet thermocouple 201 is in temperature measurement downthehole and fill the reinforcement through refractory material, and the welding is more firm, be difficult for dropping, and can not influence the heating process of steel billet 200. As shown in fig. 1, in this embodiment, the billet thermocouple 201 is connected to the signal acquisition module 720 through the thermocouple lead-out wire 710 passing through the magnetic bead, and the signal acquisition module 720 is connected to the computer 730, so that in actual operation, the acquired actual measurement values of the upper surface temperature, the central temperature, and the lower surface temperature of the billet 200 are transmitted to the signal acquisition module 720 and then fed back to the computer 730 for processing.
Example 2
The structure of the heating furnace test device of the embodiment is basically the same as that of embodiment 1, further, in the embodiment, a fresh air electric valve 310 is arranged on the fresh air pipeline 300, a fresh air grille is arranged at the inlet of the fresh air pipeline 300 to filter the introduced air, and the fresh air pipeline 300 is connected with the circulating air pipeline 500 through a flange, so that the heating furnace test device is firmer, good in sealing performance and convenient to detach; the exhaust pipeline 400 is provided with an exhaust electric valve 410, the opening degree of the air electric valve 310 is the same as that of the exhaust electric valve 410, the circulating air pipeline 500 is provided with a return air electric valve 530, and the sum of the opening degree of the return air electric valve 530 and the opening degree of the fresh air electric valve 310 is 100%, namely the fresh air supplemented by the fresh air pipeline 300 is exactly the same as the volume of the exhausted hot air, so that the capacity of the circulating air is ensured to be unchanged, and the consumption of the circulating air required for heating the billet 200 is fully ensured.
In this embodiment, the air blower 520 is arranged on the circulating air pipeline 500, the first thermocouple 510 is arranged at the front end of the air blower 520, the return air electric valve 530 is further arranged on the circulating air pipeline 500, the return air electric valve 530, the fresh air electric valve 310 and the exhaust electric valve 410 are controlled in a real-time and split-range manner, specifically, a split-range control flow algorithm is shown in fig. 5, whether the temperature of the circulating air at the front end of the air blower 520 meets the specification or not is detected in a real-time manner through the first thermocouple 510, and if the temperature of the circulating air at the front end of the air blower 520 is lower than the temperature; if the temperature of the circulating air at the front end of the blower 520 is higher than the temperature limit of the blower 520, the opening degrees of the return air electric valve 530, the fresh air electric valve 310 and the exhaust electric valve 410 are controlled in a split-range mode until the temperature of the circulating air at the front end of the blower 520 is lower than the temperature limit of the blower 520, so that the temperature at the front end of the blower 520 is not over-limited, the service life of the blower 520 is prolonged, the heat in the used hot air can be fully utilized, and energy conservation is realized.
In this embodiment, the exhaust duct 400 is provided with an exhaust cooling device 450, the exhaust cooling device 450 is provided with a cooling water electric valve 451, the outlet end of the exhaust cooling device 450 is provided with a second thermocouple 420, the rear end of the second thermocouple 420 is provided with an exhaust fan 430, and the second thermocouple 420 is used for detecting the exhaust temperature at the outlet end of the exhaust cooling device 450 and controlling the opening degree of the cooling water electric valve 451. Wherein the exhaust cooling device 450 is provided with a cooling water inlet pipeline and a cooling water outlet pipeline, the cooling water electric valve 451 is arranged on the cooling water inlet pipeline, and the exhaust temperature in the exhaust pipeline 400 is cooled through the circulating cooling of the cooling water. The specific flow of the protection and exhaust temperature control of the exhaust fan 430 is shown in fig. 6, the second thermocouple 420 detects whether the exhaust temperature meets the requirement of exhaust smoke temperature limit, if the exhaust temperature is lower than the temperature limit, the exhaust is directly discharged, if the exhaust temperature is higher than the temperature limit, the cooling water electric valve 451 on the exhaust cooling device 450 is opened to cool the exhaust temperature in the exhaust duct 400, until the exhaust temperature is lower than the temperature limit, the cooling water is closed and directly discharged to the chimney 440, so that the temperature of the exhaust fan 430 is not over-limited and the exhaust temperature reaches the standard.
The temperature control points of the air heating section I610, the air heating section II 620, the air heating section III 630 and the air heating section IV 640, which are temperature control points for installing the third thermocouple 611, the fourth thermocouple 621, the fifth thermocouple 631 and the sixth thermocouple 641, are installed at the end of each heating section. In order to ensure that the outlet temperature of the heated circulating air at the tail end of each heating section meets the requirement, the temperature control mode is the process shown in fig. 2, whether the circulating air at the tail end of the air heating I section 610 (the air heating II section 620, the air heating III section 630 and the air heating IV section 640) reaches the set value is detected in real time by the third thermocouple 611 (the fourth thermocouple 621, the fifth thermocouple 631 and the sixth thermocouple 641), if the actual measurement value of the third thermocouple 611 (the fourth thermocouple 621, the fifth thermocouple 631 and the sixth thermocouple 641) reaches the set value, the temperature controller 650 is controlled to cut off the three-phase alternating current power supply 660, the resistance wire in the furnace is cut off, and the heating is stopped; if the measured value of the third thermocouple 611 (the fourth thermocouple 621, the fifth thermocouple 631 and the sixth thermocouple 641) does not reach the set value, the temperature controller 650 is controlled to switch on the three-phase ac power supply 660, and the resistance wires in the furnace are powered on to start heating.
In the embodiment, the hearth 100 is built by adopting refractory materials, and in order to increase the radiation effect, black body materials are coated in the hearth 100, so that the billet 200 is fully heated.
In this embodiment, the bracket 130 is disposed in the heating area inside the furnace 100 to support the steel billet 200, and the bracket 130 is cooled by cooling water, so as to ensure the stability of the steel billet 200.
The third thermocouple 611 (the fourth thermocouple 621, the fifth thermocouple 631, and the sixth thermocouple 641) in the above description corresponds to the thermocouples 3(4, 5, 6) in fig. 2, respectively, the first thermocouple 510 corresponds to the thermocouple 1 in fig. 5, and the second thermocouple 420 corresponds to the thermocouple 2 in fig. 6.
The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.
Claims (10)
1. The utility model provides a heating furnace test device which characterized in that: the heating furnace comprises a furnace hearth (100), wherein a bracket (130) used for bearing a steel billet (200) is arranged in the furnace hearth (100), circulating air enters the furnace hearth (100) through a sectional temperature control unit, the sectional temperature control unit comprises a plurality of heating sections with different heating curves, and the circulating air sequentially enters the furnace hearth (100) through the heating sections to heat the steel billet (200); the outlet of the hearth (100) is provided with a hot air outlet pipeline (110), circulating air is divided into two paths through the hot air outlet pipeline (110), one path of circulating air is directly discharged through an exhaust pipeline (400), the other path of circulating air is mixed with fresh air from a fresh air pipeline (300) and then enters a circulating air pipeline (500), and the mixed circulating air enters the hearth (100) through a sectional temperature control unit again, so that continuous heating of steel billets (200) is realized.
2. A heater test unit according to claim 1, wherein: the sectional type temperature control unit comprises an air heating I section (610), an air heating II section (620), an air heating III section (630) and an air heating IV section (640) which are sequentially arranged along the direction close to the hearth (100), and the tail ends of the air heating I section (610), the air heating II section (620), the air heating III section (630) and the air heating IV section (640) are respectively provided with a third thermocouple (611), a fourth thermocouple (621), a fifth thermocouple (631) and a sixth thermocouple (641).
3. A heater test unit according to claim 2, wherein: the sectional type temperature control unit further comprises a three-phase alternating current power supply (660), wherein the three-phase alternating current power supply (660) is connected with resistance wires in each heating section through a three-phase alternating current contactor (670), and heats the air heating I section (610), the air heating II section (620), the air heating III section (630) and the air heating IV section (640) through the resistance wires.
4. A heater test unit according to claim 3, wherein: temperature controllers (650) are arranged on the air heating I section (610), the air heating II section (620), the air heating III section (630) and the air heating IV section (640).
5. A heater test unit according to claim 1, wherein: a guide plate (120) extends downwards from the top of the hearth (100) close to the outlet.
6. A heater test unit according to claim 1, wherein: temperature measuring holes with different depths are formed in the steel billet (200), and a steel billet thermocouple (201) is welded in the temperature measuring holes and is filled and reinforced through refractory materials.
7. A heater test unit according to claim 6, characterized in that: the billet thermocouple (201) is connected with the signal acquisition module (720) through a thermocouple lead-out wire (710) penetrating the magnetic beads, and the signal acquisition module (720) is connected with the computer (730).
8. A heater test unit according to claim 1, wherein: the fresh air pipeline (300) is provided with a fresh air electric valve (310), the exhaust pipeline (400) is provided with an exhaust electric valve (410), and the opening degree of the fresh air electric valve (310) is the same as that of the exhaust electric valve (410).
9. A heater test unit according to claim 8, wherein: the circulating air pipeline (500) is provided with an air blower (520), the front end of the air blower (520) is provided with a first thermocouple (510), the circulating air pipeline (500) is further provided with an air return electric valve (530), and the sum of the opening degree of the air return electric valve (530) and the opening degree of the fresh air electric valve (310) is 100%.
10. A heater test unit according to any one of claims 1 to 9, wherein: an exhaust cooling device (450) is arranged on the exhaust pipeline (400), a cooling water electric valve (451) is arranged on the exhaust cooling device (450), a second thermocouple (420) is arranged at the outlet end of the exhaust cooling device (450), an exhaust fan (430) is arranged at the rear end of the second thermocouple (420), and the second thermocouple (420) is used for detecting the exhaust temperature at the outlet end of the exhaust cooling device (450) and controlling the opening degree of the cooling water electric valve (451).
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| CN201921049234.XU CN210826292U (en) | 2019-07-05 | 2019-07-05 | Heating furnace test device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110184444A (en) * | 2019-07-05 | 2019-08-30 | 安徽工业大学 | A kind of furnace trial device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110184444A (en) * | 2019-07-05 | 2019-08-30 | 安徽工业大学 | A kind of furnace trial device |
| CN110184444B (en) * | 2019-07-05 | 2024-02-27 | 安徽工业大学 | Heating furnace test device |
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